平纹织物三点梁弯曲有限元模拟与分析

Three-Point Bending Simulation and Analysis of Plain Woven Fabric by Finite Element Method

基于纱线与织物性能原位综合测试系统(CHES-FY),采用有限元软件ABAQUS构造平纹织物的三点梁弯曲模型,并实施弯曲模拟分析.通过模拟计算得到了织物中纱线应力分布和压针上抗弯力-位移曲线,提取弯曲特征指标(抗弯力、抗弯功和抗弯斜率),与试验测得的抗弯力-位移曲线对比分析,并讨论了纱线模量、托针间距和纱线摩擦因数对弯曲性能特征指标的影响.结果表明:织物弯曲时,经纱方向受力较大,纬纱方向受力较小;压针上的抗弯力-位移模拟曲线和实测曲线趋势相同,呈先上升到最高点、后下降的趋势;随着纱线模量的增加,托针间距增加,纱线摩擦因数增加,压针上抗弯力、抗弯功和抗弯斜率也随之增加.模拟分析与试验结果一致,从而证明了有限元方法模拟织物弯曲的可行性.

Based on the comprehensive handle evaluation system for fabric and yarn（CHES-FY）, three- point bending deformation of fabric was simulated by ABAQUS software. Stress distribution of yarns of fabric and force-displacement curve by simulation were acquired, and bending indices were featured, including bending force, bending work arid bending slope. Comparison between experimental and theoretical results was conducted, and effects of yarn modulus, needle distance and yarn friction coefficient on simulation results were also analyzed. Conclusions can be drawn that fabric bending force in the warp direction is larger than that in weft diiection, and experimental and theoretical force - displacement curves exist similar changing trend, i.e., firstly increasing and then decreasing; moreover, with the increase of yarn modulus, the increase of needle distance and the increase of yarn friction coefficient,anti-bending force on the pressure needle, bending work and. bending slope correspondingly increase. This simulation is consistent with the test results, which demonstrates the feasibility of simulating fabric bending by finite element method.